/Engine/Plugins/Experimental/PCG/Source/PCG/Public/PCGCommon.h
As discussed just before, a parallel version for "exclusive" (as in only type) of the EPCGDataType enum. Needed for blueprint compatibility.
enum EPCGExclusiveDataType { None = 0, Point, Spline, LandscapeSpline, PolyLine, Landscape, Texture, RenderTarget, BaseTexture, Surface, Volume, Primitive, Concrete, Composite, Spatial, Param, Settings, Other, Any, }